Re: Equipment Error and Accuracy to be included in Uncertainty Calculations?
Very good question.
I would include a component for accuracy or tolerance of your standard, distributed rectangularly, along with applying the correction of the standard.
This way you are allowing for a drift over time of your standard. Assuming that this drift stays within the standard's stated accuracy or tolerance limit.
I'm sure there will be more explanations that are better than mine. This is just my initial take on your question.